Furniture-spring



(No Model.) I

G. J. HARTMAN.

' FURNITURE SPRING. No.307,300. Patented Oct. 28,1884.

INVEN TOR ATTORNEY N FETER$ Pmnvljthngrupher. Wnhinglml. D. I;

UNITED STATES PATENT OFFICE.

GEORGE .I. IIARTMAN, OF LAKE, ASSIGNOR OF ONE-HALF TO lVILIiIAM II. LOTZ, OF CHICAGO, ILLINOIS.

FURNITURE-SPRING.

SPECIFICATION forming part; of Letters Patent No. 307,300, dated October 28, 1884.

Application filed June 21, 1883. (No model.)

T0 at whom, it may concern:

Be it known that I, GEORGE J. HIRTMAN, a citizen of the United States of America, residing at town of Lake, in the county of Cook and State of Illinois, have invented certain new and useful Improvements iirFurniture- Springs, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to springs adapted for car-seats and other upholstered furniture, and more particularly to elliptic springs made of iiat steel, that are fixed in rows upon the supporting-frame. These springs heretofore were secured either by overlapping their ends and securing them thus rigidly together with rivets in a manner to form a solid ring, or by rigidly clamping the ends between two slats, or by riveting the ends to plates or clasps that were secured to the seat-frame. In either one of these constructions, however, such springs, by their stiff end connections, will lose the greater portion of their elasticity at or near the points where mainly needed, and are apt to break from the frequent strains brought upon them, and after breaking the sharp ends of the fractured spring will point upward and will cut through and damage the upholsteriug.

The object of my invention is to produce a spring of the kind described that will have uniform elasticity at all points, and that will yield to the heaviest pressure without breaking; and it consists in flexibly coupling the ends of each spring to the supporting-frame, or to a link that forms the fixture for holding the spring in position, all as hereinafter described and specifically claimed.

In the drawings, Figure 1 represents a perspective view of a series of springs as secured to the seat-frame bar; Fig. 2, a plan of the link fixture; Fig. 3, a longitudinal section of the same, Fig. 4., an elevation of the spring when at rest, and Fig. 5 an elevation of the same when compressed.

Corresponding letters in the several figures of the drawings designate like parts.

A represents the spring, formed of a strip of flat steel, the ends of which, after being an nealed, are bent and lapped to form eyesa a, the lapped ends being secured to the body of the spring each by a rivet.

B denotes a metal plate that has a central countersunk hole, Z), for securing it bya woodscrew, and has cylindrical bars 0 to itsends, over each of which the eyelapped end of a spring A is bent before riveting, so as to form a hi-ngeconnection therewith. In this manner the plate B forms a loose-jointed eonnecting-link between the two ends of a spring A, that will allow such spring to form independent curved lines at either end, while yielding to a pressure, that are within the elasticlimit of the spring and are not injurious toit, while springs having both ends stiff or rigidly connected will be exposed to strains that are destructible to them. These springs are arranged in rows upon a longitudinal bar, D, and are secured thereto each by a wood-screw through hole b of plate B, and in case one of them should break from not having the proper temper its fragments will offer no resistance to the upholstering, but will hang downward below the surface of the balance 0 i the springs, where they can do no harm or injury, and can be easily detected and renewed.

\Vhat I claim is The plate B, provided wit-h end bars, 0, and secured to bar D. in combination with elliptic spring A, formed of flat steel, and provided at each end with an eye, a, the ends of said spring being pivotally connected to the end bars of said plate, as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE .I. HARTMAN.

Witnesses:

H. W. HUEHL, R. G. SOHMID. 

